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Hydraulically Operated Scraping/Deburring Tool

IP.com Disclosure Number: IPCOM000232142D
Publication Date: 2013-Oct-21
Document File: 4 page(s) / 758K

Publishing Venue

The IP.com Prior Art Database

Abstract

This invention provides a downhole scraper which is operated by flowing fluids through it. Deburring operations may increase the effectiveness of bridge plugs and/or ball sealer systems to permit chemical treatment of elected zones. Scraping operations can remove scale, corrosion and other material from the ID of casing. There are downhole tools that uses flow activated vibration to free and retrieve stuck fishes. This invention employs the similar mechanism to generate reciprocal movement and drive scraping blocks or brushes, in order to clean up well bore ID. As showed in figure 1, the tool has two functional modules: 1. Scraping blocks/brushes carried by a spring loaded sleeve (purple part) for cleaning; and 2. Pressure pulse generating valve. Together the two modules create a reciprocal motion in the axial direction and drive the scraping parts to clean up casing ID. Figure 2 is a zoom-in of the pressure pulse valve. Initially the valve is closed. Pressure from the surface shifts the ported part (red) and scraping blocks carrier (green and purple) toward the lower end. At one point, the ported part stops moving either spring #1 is compressed to solid or it hits a shoulder. And scraping block carrier keeps moving down under the influence of pressure, until it uncovers the lower slots of the ported part. Now fluids can flow through the upper slots into the mini-annular space and then flow back into the ported part ID through the lower slots, and pressure starts to drop, as showed in figure 3. As the pressure bleeds off, the spring #3 overcomes the hydraulic force and shifts the carrier back up and the lower slots of the ported part is covered. Pressure pulse valve is closed again. In this design, spring #3 is essential for the tool to work. Spring #1 shifts ported part up as pressure bleeds off, in this way its lower slots can stay un-covered longer to improve tool's efficiency. Spring #2 is to reduce the impact as the scraping block carrier shifts up. As figure 5 shows, the scraping blocks can be put in stacked set to have a full range cover on casing ID. Just like the existing designs, the blocks are spring loaded and retrackable.

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Hydraulically Operated Scraping/Deburring Tool

This invention provides a downhole scraper which is operated by flowing fluids through it.

Deburring operations may increase the effectiveness of bridge plugs and/or ball sealer systems to permit chemical treatment of elected zones.  Scraping operations can remove scale, corrosion and other material from the ID of casing.  There are downhole tools that uses flow activated vibration to free and retrieve stuck fishes.  This invention employs the similar mechanism to generate reciprocal movement and drive scraping blocks or brushes, in order to clean up well bore ID.  As showed in figure 1, the tool has two functional modules:

1. Scraping blocks/brushes carried by a spring loaded sleeve (purple part) for cleaning; and

2. Pressure pulse generating valve.

Together the two modules create a reciprocal motion in the axial direction and drive the scraping parts to clean up casing ID.  Figure 2 is a zoom-in of the pressure pulse valve.  Initially the valve is closed.  Pressure from the surface shifts the ported part (red) and scraping blocks carrier (green and purple) toward the lower end.  At one point, the ported part stops moving either spring #1 is compressed to solid or it hits a shoulder.  And scraping block carrier keeps moving down under the influence of pressure, until it uncovers the lower slots of the ported part.  Now fluids can flow through the upper slots into the mini-annular space and then flow back into the port...